Oh, but wait. I get your point, about taking the time to make some food so the family doesn't have to concern themselves with cooking during the mourning period, but...
Lasagna is not a casserole. If and when a member of my family dies and a lasagna appears from a thoughtful neighbor I will belt out a tune of joy.
A casserole, to me, anyway, means something with macaroni and tuna fish and those awful dried French onions cooked on the top. Or green beans and those onions, but never a lasagna.
lasagna, takes, like forever to prepare, so you've gone above and beyond your call of good neighbor duty.